One thing about Tula small-rifle primers (and some other brands) is they offer several models, which differ in cup hardness/thickness.
The Tula SR primer I'm using is their "softest," the KVB-223. Despite the model name, they don't recommend it for AR-15's, or any other cartridge where pressures are normally much over 50,000 PSI.
But I load a lot of cartridges where standard SAAMI pressures don't exceed 50,000, including the .17 Hornady Hornet and .22 Hornet, and 50,000 is the SAAMI maximum average pressure for the .222 Remington. The KVB-223 works fine in all three of those rounds, and I've also had no problems with it in the .17 Fireball (SAAMI MAP 55,000), where accuracy was as good as with any other primer, and in normal loads in bolt-action .223's. But I usually use tougher-cup primers in the .223, because I might use any of my .223 handloads in an AR-15.
If you tend to push pressures by working up loads until you encounter "pressure signs," you'll probably encounter some with the Tula KVB-223. It would not, for instance, be a primer I'd recommend for the .223 Ackley Improved, or any of the factory rounds where SAAMI pressures (and hence published loading data) exceed 55,000 PSI. The list of such cartriges might surprise you. As an example, while the .17 Fireball's SAAMI MAP is only 55,000 PSI, the .221 Fireball's is 60,000.
Some other small-rifle primers aren't recommended for higher-pressure rounds, including the Remington 6-1/2. I describe the history and reasons behind all this in my new handloading book, but thought posting a caution here would also be a good idea.
